ATTO Technology, Inc.
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Troubleshooting ExpressSAS SAS/SATA
Host Bus Adapters (HBAs)

Common ExpressSAS Issues and Solutions



Quantum LTO4 HH SAS tape drives problem

Both ATTO Technology, Inc and Quantum Corp. have received reports of an incompatibility between ATTO ExpressSAS H380, H308, H30F, R380, R348, and R30F cards and Quantum's LTO4 HH SAS tape drives. This incompatibility can be resolved by applying the latest firmware available from Quantum to the drive, which is available at the Quantam Support and Documentation page. Please contact ATTO Technology or Quantum Technical Support if you encounter any problems updating the firmware to the drive.


ExpressSAS RAID adapters tend to run hot in a Mac Pro

Previously, we had been instructing customers to install fan control software to speed up the cooling fans to provide additional cooling. Now, the version 1.20 driver includes a fan speed control daemon. This eliminates the need for a separate program to control fan speed. We have recently updated our fan speed control daemon to support the new 2010 Mac Pro (MacPro5,1) platform. It is bundled in the current driver release for 3Gb and 6Gb ExpressSAS RAID adapters.


Problems accessing tape drives attached to a UL5D in a Intel-based Mac Pro or X-Serve

Since the release of OS 10.4.10, there have been a number of reported problems accessing tape drives with EMC Retrospect and other backup programs. These usually materialize as system freezes or backups hang. This has been reported mostly with LTO3 and Sony AIT-4 or AIT-5 tape drives, but may happen with other types also. ATTO has implemented a work around for this in the OS X SCSI driver version 4.20 or greater. This driver is available on the ATTO downloads page.